I am so very sorry for your loss.
It may have been a stroke as you thought or another neurological event …. sometimes medication from the vet can help but often nothing can be done and the rattie will die.
I know how hard it is to hold your pet and try to comfort them while they die, helpless to do anything … but I am glad that Molly was not alone. I am sure your presence made her feel comforted and less afraid
{{hugs}}
I am sorry that a knowledgeable person was not able to respond.
For future reference, there is a medical site on facebook (Real Rat Lovers Want To Know) which has several medical contributors including lilspaz68. Given the number of medical contributors as well as their placement in different countries, people may receive a more timely response on there.